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CVE-2021-40823

Published: 13 September 2021

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
element-web
Launchpad, Ubuntu, Debian
impish Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

trusty Does not exist

upstream Needs triage

xenial Ignored
(end of standard support)
jammy Does not exist

kinetic Does not exist

lunar Does not exist

mantic Does not exist

node-matrix-js-sdk
Launchpad, Ubuntu, Debian
impish Ignored
(end of life)
bionic Does not exist

focal Needs triage

trusty Does not exist

xenial Ignored
(end of standard support)
upstream Needs triage

hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
jammy Needs triage

lunar Ignored
(end of life, was needs-triage)
mantic Needs triage

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N